Science & Mathematics - 18 October 2006

say that a string with a stopper at the end is tied down to an opening and then the stopper blown vertically off the opening at 5 m/s. How can i calculate the force acting on the string when the string is fully extended into the air? I know the mass of the stopper is 0.012g, the string is 0.46 m long, and i have other information which i'm not sure is useful (f.x. the inital force acting on the stopper as it blows off the opening is 64 N) Can someone please show me this calculation? Assume no air

2006-10-18 13:42:27 · 2 answers · asked by Isabelle 2 in Physics

2006-10-18 13:40:56 · 3 answers · asked by CRYSTAL D S 1 in Mathematics

2006-10-18 13:40:53 · 5 answers · asked by brianjos80 1 in Mathematics

Assume that the suburb has a population of 698000 and is growing at a rate of 4000 per year. Assume that the city has a population of 906000 and is declining at a rate of 12000 per year.

In how many years will the populations of the suburb and the city be equal?

What will the populations be when they are equal?

i got the equations
p=698,000 + 4000y
P=906000 - 12000y

what am i doing wrong

2006-10-18 13:39:48 · 7 answers · asked by Diggler AKA The Cab Driver 1 in Mathematics

I need help today now please

2006-10-18 13:39:46 · 4 answers · asked by Sarah S 1 in Other - Science

2006-10-18 13:39:24 · 9 answers · asked by C.J. W 3 in Mathematics

and want to be an engineer probably a civil engineer, but it says for the requirments that in grade 12 i either need physics 12 or chemistry 12 which one would be best to take?

2006-10-18 13:39:05 · 9 answers · asked by Anonymous in Engineering

If the ball is allowed to fall to the ground, what will its speed be the instant before it hits the ground?

2006-10-18 13:38:34 · 3 answers · asked by Daniel Black 1 in Physics

Discuss the concentration of solar energy and the earth's tilt.

2006-10-18 13:37:29 · 5 answers · asked by Anonymous in Weather

Which of the numbers is the solution of 85 - 2x = 67?

2006-10-18 13:37:21 · 6 answers · asked by Anonymous in Mathematics

2006-10-18 13:37:15 · 4 answers · asked by mike 1 in Biology

Which of the following statements is true with respect to AgCl?

A) Ksp is same as its solubility.
B) Ksp of AgCl is the same in 6.5 × 10–3 M AgNO3 as in water.
C) The solubility of AgCl is independent of the concentration of AgNO3.
D) [Ag+] in solution changes significantly after the addition of AgCl to 6.5 × 10–3 M AgNO3.

explain why, im having a hard time understanding this stuff, the book is much more complicated then when people explain it.

2006-10-18 13:36:40 · 1 answers · asked by axcryingxshame 1 in Chemistry

2006-10-18 13:36:19 · 6 answers · asked by i_love_abc23 1 in Mathematics

Morpholigically speaking (as in, what structures cause them to be a part of the flower family)

2006-10-18 13:36:09 · 7 answers · asked by salpiy 1 in Botany

discuss the wavelength of light, the reflection by molecules in the atmosphere , and what happens to the other colors.

2006-10-18 13:34:08 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2006-10-18 13:32:13 · 19 answers · asked by Anonymous in Zoology

How much is 890 square kilometres?No,this is not my homework,don't worry,I promise it's not.I'm only in 5th grade,if you could help and give a positive answer,it'll be appreciated.

2006-10-18 13:31:27 · 4 answers · asked by Vivien 3 in Mathematics

2006-10-18 13:30:11 · 21 answers · asked by Anonymous in Zoology

I need help with this problem.
What formula would you use?

2006-10-18 13:29:33 · 5 answers · asked by swimmertommy 1 in Physics

Na2CO3 + H2SO4----->

Na2CO3 + H2SO4-----> Na2SO4 + CO2 + H2O

or

Na2CO3 + H2SO4-----> Na2SO4 + H2CO3

I'm not sure which it is...I'm unsure of what to do when there's an acid in a metathesis rxn...if the first one is correct, how do I know the states of the products??

thanks for any help!!!

2006-10-18 13:29:33 · 2 answers · asked by Anonymous in Chemistry

The Memory Jog:The bank where Elmer and Pearl live just got a shiny, new ATM machine. So, they decided they had to get one of them-there cards so they could get their money any time-even on Sunday-going -to-Church day.
But, when the manager said to pick a 7-digit number that you won't forget, and don't use your birthday , etc. they had a problem. They were not good at remembering stuff. What to do! What to do! Then the light come on! Elmer Picked 1058421. Pearl picked 6060247. They exchange information on how they would remember their numbers.Pearl said, "That's a real handy number, Elmer. But I think mine is more timely." Can you figure out what they were using for a memory jog?

2006-10-18 13:28:56 · 4 answers · asked by old_man_4u2002 1 in Other - Science

I live in Michigan and this nasty brown spider crawled up out of my floor vent last night and I about freaked. It makes me think that my bite on my neck may have been from a similar spider. It was pretty big (not tranchula big, but big for me) and brown. Quite fluidy too. Any idea what type of spiders Michigan harbors and how to avoid/kill them? My bite on my neck was gross and hurt!!

2006-10-18 13:28:09 · 8 answers · asked by SadToday22 3 in Biology

i need some help please

2006-10-18 13:28:06 · 15 answers · asked by heyy sunny. < 3 2 in Mathematics

2006-10-18 13:27:57 · 8 answers · asked by i_love_abc23 1 in Mathematics

2006-10-18 13:26:57 · 4 answers · asked by jimcmillan 2 in Physics

ok lets just say im not doing so good in math class. how should i tell my parents? should i just be like .. can i stay after? im having trouble. suggestions pleaseee <33

2006-10-18 13:26:52 · 10 answers · asked by Sarah.* 1 in Mathematics

I need help with this problem.
What formula would you use?

2006-10-18 13:26:04 · 1 answers · asked by swimmertommy 1 in Physics

I'm trying to solve this investment problem when two accounts are equal. I get the two equations set equal to each other.
4600e^0.073t = 7500e^0.040t
I need to solve this for t but I never can get it right. How do you get t? I'm having a total brain freeze.

2006-10-18 13:24:34 · 2 answers · asked by Anonymous in Mathematics

2006-10-18 13:23:59 · 10 answers · asked by alizay 11 1 in Geography

please explain.

Does it prevent a reading of pH 7 from being obtained following dilution of acid or base to a concentration of 10-7 mol dm-3?

please help!

2006-10-18 13:22:55 · 2 answers · asked by jane 62 1 in Chemistry